This could be a fault in the matrix decoder for the screen drive. It may also be a defect in the screen substrate itself.

If you take the set to the Samsung service rep, they will try the various boards to determine the failed board. They they can swap the board to fix the set. Then they will do the configurations as necessary to make sure it is working to specs.

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https://www.youtube.com/watch?v=L9cjcsysdW4
Sep 11, 2012 - Uploaded by Roberto Ramos
TV screen begins to flicker then screen turns black while the audio continues to heard. I'm unable to see the TV Menu options when screen turns off. ... After turning the TV OFF then back ON again, the screen will flicker and then ... 1:26. Samsung LEDTV Repair - T-Con Board Replacement - No Picture on ...

I have the same problem with a 40" Toshiba LCD, Component cables work fine with FIOS but not HMDI, goes in and out then blank. HDMI with DVD player works fine. Best buy reported this same problem from users with this toshiba lcd but no solution.

I have the same problem here on this Samsung 40" LCD. its a 2007 model. everything was fine until recently. I had to reset my digital cable box. now the picture has the green tint. its ruined what was a nice tv, and it won't go away.

If the lines are thin and close together running horizontally, it may be the vertical driver, but that usually takes out the resistor and sometimes the diode in the B+ for the vert. Also you must replace the caps that caused the problem in the first place.